A senior Russian diplomat says Moscow plans to provide advanced air defenses to Damascus to deter foreign military action against Syria's pro-Russian government, which is embroiled in a civil war.

Russian Deputy Foreign Minister Sergei Ryabkov said Tuesday the planned transfer of S-300 anti-aircraft missiles to the government of Syrian President Bashar al-Assad will be a "stabilizing factor" for the country.

Russia's S-300 Missiles

Surface-to-air anti-aircraft missile

Vertical launch, short deployment time

Range up to 150 kilometers

7.5 meters long

Developed in the1960s, 1970s by the then-Soviet Union

Several variants are manufactured

He told reporters that Moscow believes the sale will deter what he called "some hotheads" from considering options to send foreign forces to intervene in the Syrian conflict.

But Ryabkov gave no indication of when Russia will transfer the air defense system. Damascus signed a contract to buy it several years ago.

Israel and the United States have urged Russia not to proceed with the sale, fearing the air defense system will threaten Israeli security and complicate any military action they may take in Syria.

Amid widening Lebanese involvement in fighting in Syria - witnessed in the battle for the western Syrian town of Qusair -- Russia confirmed Tuesday that it will sell advanced anti-aircraft missiles to the Syrian government. It comes a day after the EU voted to allow the supply of weapons to the Syrian opposition. Henry Ridgwell reports for VOA from London.

"Obviously from our perspective it is a threat at this stage," he said. "I cannot affirm that things have been expedited. The shipments are not on their way yet, this I can say. I hope they will not leave and if, God forbid, they reach Syria, we will know what to do."

Western sources said Israel carried out several air strikes in Syria earlier this month, apparently to stop the Syrian government from transferring sophisticated weapons to the pro-Assad Lebanese militant group Hezbollah. Israel has neither confirmed nor denied responsibility for the strikes.

The Russian deputy foreign minister also criticized an EU decision to lift its arms embargo on the main opposition Syrian National Coalition while maintaining sanctions against the Syrian government.

Ryabkov accused the 27-nation bloc of "pouring more fuel on the fire" of Syria's civil war and "damaging" prospects for a U.S. and Russian-proposed peace conference to resolve the two-year conflict.

EU action

EU Arms Embargo for Syria

No longer forbids supplying arms to Syria's opposition forces

No immediate arms shipments are planned

Safeguards would ensure supplies are for protection of civilians

Arms embargo was part of package of sanctions imposed in 2011

EU plans further sanctions on President Bashar al-Assad's government

The EU decided to lift the embargo on Syrian rebels at a meeting in Brussels on Monday. But, EU officials gave mixed messages about when such weapons transfers might begin.

Some officials said all EU members agreed to delay any arming of the rebels until August 1 to allow the U.S.-Russian peace initiative to proceed.

But British Foreign Secretary William Hague said Tuesday there is no requirement to wait until August to send weapons, although he reiterated that London has no immediate plans to do so.

Syrian National Coalition spokesman Louay Safi told the French news agency that the EU move is a "positive step" but may be "too little, too late."

In separate remarks to the news agency, a spokesman for the SNC-backed Free Syrian Army criticized the EU, saying that delaying any arms transfers by two months would leave the Syrian people vulnerable to continued "genocide" by the Assad government.

Opposition in bind

A boy walks on the rubble of buildings damaged by what activists said were missiles fired by Syrian Air Force fighter jets loyal to President Bashar al-Assad in Salqin city, Idlib governate, May 28, 2013.

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A boy walks on the rubble of buildings damaged by what activists said were missiles fired by Syrian Air Force fighter jets loyal to President Bashar al-Assad in Salqin city, Idlib governate, May 28, 2013.

Some analysts believe recent events may force the opposition’s hand.

At the IHS Jane’s security firm, analyst David Hartwell said Assad has been strengthened in recent weeks by the Russian missiles, other weapons from Iran, support from Lebanon's Hezbollah and recent battlefield gains.

“All of these factors appear to be coalescing at this moment in time to give him, or certainly give the appearance, that he can think about long-term survival,” he said.

Hartwell said confidence is up within the Assad regime, and it could press for more military advances in the coming days, including a possible assault on the country’s largest city, Aleppo.

Syria-watcher Chris Doyle of the Council for Arab-British Understanding said that Assad is in a strong enough position that he might survive politically, at least during a transition period.

“I think that cannot be ruled out, as distasteful as that is, given his record," he said. "If it is symbolic, then maybe that is something that people will have to agree to, while holding their noses.”

Lebanon spillover

Meanwhile, there were more signs of Syria's conflict spilling over into Lebanon with deadly results.

Lebanese security sources said several rockets fired from Syria struck the northeastern Lebanese town of Hermel near the border on Tuesday, killing a woman and wounding several other people. Hermel's Shi'ite population supports Hezbollah militants who have crossed into Syria to fight alongside Assad's troops.

Lebanese authorities said unknown gunmen also killed three Lebanese soldiers manning a checkpoint near the northeastern village of Arsal before dawn Tuesday.

Lebanese Sunnis have used border villages such as Arsal to send weapons and fighters into Syria to help the country's predominantly Sunni rebels fight the Assad government.

VOA's Al Pessin contributed to this report from London and Michael Lipin from Washington.

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